Posting its ninth win in its last 12 Pac-10 games, UO took its second-ever series from the 11-time national champions. The Ducks also claimed their fourth straight league series the past month after sweeping Oregon State and holding 2-1 edges at then-No. 9 Arizona and vs. then-No. 10 Stanford.

Including other results from around the Pac-10 Saturday, UO tied for third in the final conference standings and tied its second-best league finish ever. Oregon's +.500 league mark (11-10) also stood as its second ever after its Pac-10 runner-up mark of 13-7 in 1989, and first since the Pac-10 expanded to eight teams in 1993.

“We stepped up our game today, and finished the season with good momentum,” Oregon head coach Mike White said. “Our pitching is doing well, and when we play good defense we have shown we can beat anybody. We knew we needed to win today to improve our chances to host a regional, and our team came out fired up. It was also great this weekend for our seniors to beat one of the nation’s most respected programs for the first time in their careers.”

En route to her fourth combined shutout of the season, the Lakeport, Calif., native Rumfelt (6-0) struck out seven - one shy of her season high - walked five and allowed three hits.

"I've felt like I've progressed this part of the season, and was glad to be at my best today," Rumfelt said. "My location was good early, and Jess (ica Moore) was there at the end to bail me out. (Being Senior Day) I wasn't too nervous, partly because my mom didn't cry - that really helped. It was fun to be out here on a special day and have a chance to start."

After Rumfelt gave up two singles and a walk to open the seventh inning, sophomore Jessica Moore came in with the bases loaded and no outs, and immediately coaxed a 5-2-3 double play grounder to third base. She also retired the next batter on a ground-out to third base to earn her third save of the season.

At the plate for Oregon, junior Kelsey Chambers broke a 0-0 tie in the fourth inning with a solo homer over the right center field wall - her fifth homer in the last eight games.

Her team-leading 13 round-tripper of 2011 also knocked in her seventh game-winning RBI of the campaign (second-best for UO, and two behind Monique Fuiava), and moved her up UO all-time lists for homers in a season (sixth) and career (seventh, 26).

Those two home runs also punctuated a team season record (70) that bettered the former mark (69) set in a 69-game season in 1999.

The team's other senior, Monique Fuiava, accounted for Oregon's last RBI in the fifth inning, with an opposite-field single that scored freshman Courtney Ceo. The latter player had reached via a one-out single, advanced to second on her team-leading 14th steal of the season, then moved to third on a wild pitch.

"Today was a day to play for each other and give it our all," Fuiava said. "The last time we won on senior day was my freshman year so it was nice to end it this way. We have worked hard to put ourselves in position to be at our best this time of the year. I love my teammates, so today was special in many ways. We wanted to step off the field today not having any regrets."

Fuiava also debuted on the Duck all-time career RBI list (ninth, 103-tied), and the Lynwood, Calif., native was already easy to spot in similar categories for doubles (fourth, 37) and homers (sixth, 27).

At game's end, Pappas led UO in hits (3-for-3), and five others finished with single hits - sophomore Allie Burger, Ceo, Chambers, Fuiava and Peterson.

Earlier in the series, UO pulled out an emotional 6-5 win Thursday night and ended a 15-game series losing streak, while UCLA won, 7-4, Friday night. UO took the season series for only the second time in the rivalry dating back to 1985 after it swept the Bruins, 3-0, in 2005, while the two teams had tied once in 1998 (2-2).

On the mound, Moore pitched 13.1 of the team's 21 innings since Thursday, logged 19 strikeouts, five walks and a 3.15 ERA, and gave up 16 hits. Rumfelt finished with a 1.83 weekend ERA based on Saturday's effort.

In other action around the Pac-10 Saturday, No. 1 Arizona State scored four runs in the fifth inning to beat Stanford, 4-1, in Tempe; No. 5 California came from behind with four runs in the sixth to top No. 10 Arizona, 6-3, in Tucson; and No. 14 Washington scored four runs in the seventh inning to edge Oregon State, 5-4, in Corvallis.

Wrapping up the final day of league play, No. 1 Arizona State (50-6, 17-4) claimed the conference title by two games over by No. 5 California (39-10, 15-6).

Returning national runner-up and No. 10 Arizona (40-16, 11-10) tied with Oregon (39-14, 11-10) for third place, one game ahead of No. 11 Stanford (38-14, 10-11) who followed in fifth place.

12 UCLA (33-16, 9-12) and No. 14 Washington (34-14, 9-12) followed in a tie for sixth place, and Oregon State (eighth, 19-27, 2-19) rounded out the eight-team standings.

Looking ahead to Sunday, the softball world will tune into the 64-team NCAA Tournament selection show that runs from 7-8 p.m. PT on ESPN-U.

Next weekend, the postseason kicks off with 16, four-team regionals held Thursday-Saturday, May 19-22.

Eight, two-team, two-day Super Regionals are set for the following weekend on Thursday-Sunday, May 26-29, and the Women’s College World Series in Oklahoma City, Okla., caps the season on Thursday-Wednesday, June 2-8.

Each weekend series is double-elimination format, and more information on the NCAA tourney is available at the www.NCAAsports.com website.